html,
body {
  display: flex;
}

html .leftBox,
body .leftBox {
  width: 480px;
  position: relative;
  overflow: hidden;
}

html .leftBox ul,
body .leftBox ul {
  position: absolute;
  top: 0;
  left: 0;
  width: 1920px;
  overflow: hidden;
}

html .leftBox ul li,
body .leftBox ul li {
  float: left;
}

html .leftBox ul li img,
body .leftBox ul li img {
  width: 480px;
  height: 753px;
}

html .rightBox,
body .rightBox {
  width: 1000px;
  height: 753px;
  position: relative;
}

html .rightBox .regBox,
body .rightBox .regBox {
  position: absolute;
  top: 100px;
  left: 200px;
}

html .rightBox .regBox .welcome,
body .rightBox .regBox .welcome {
  font-size: 44px;
  margin-bottom: 20px;
}

html .rightBox .regBox .txt,
body .rightBox .regBox .txt {
  font-size: 28px;
  margin-bottom: 64px;
}

html .rightBox .regBox form input,
body .rightBox .regBox form input {
  border: 1px #aaa solid;
  border-radius: 4px;
  text-align: left;
  font-size: 20px;
  width: 438px;
  height: 50px;
  line-height: 50px;
  padding: 0 20px;
}

html .rightBox .regBox form .err,
body .rightBox .regBox form .err {
  display: block;
  height: 30px;
  line-height: 30px;
  margin-bottom: 10px;
}

html .rightBox .regBox form button,
body .rightBox .regBox form button {
  width: 478px;
  height: 60px;
  text-align: center;
  line-height: 60px;
  font-size: 24px;
  color: #fff;
  background-color: #3487ff;
  border: none;
}
